Apartment House for Interbau Exhibition, Berlin-Hansaviertel, 1955-1957: Section, 1:200

Black ink and purple watercolor, with touches of white gouache, on off-white wove paper; verso: black ink and graphite

Watercolor over graphite on off-white wove paper

Graphite and ink on paper

Crayon on paper

Watercolor over graphite on off-white wove paper

Colored crayons on paper

Tempera on purple construction paper

Black ink on off-white wove paper

Watercolor and white gouache on cream wove paper

Graphite and colored chalk on brown wove paper

Graphite on paper

Watercolor and graphite on white wove paper